预折管的耐撞性分析和多目标参数优化

Crashing analysis and parameter optimization design of different origami pattern tubes

本文主要介绍两种预折管,它与传统薄壁管不同的是其管壁上有一些褶皱。文章首先介绍了两种预折管的几何结构;然后建立预折管的有限元模型并验证有限元模型的正确性;其次对预折管的几何参数进行参数分析,发现b(两相邻菱形叶顶点间的长度),l(两相邻菱形叶顶点间的宽度),t(管壁厚度)对结构的吸能特性有着重要的影响;最后对预折管的几何参数进行了对多目标优化,优化目标是获得最小的IPF和最大的比吸能(SEA),通过RBF代理模型和遗传算法二代(NSGA-II)得到了优化的Pareto解集。优化结果显示预折管具有更优的耐撞性,可以作为一种潜在的吸能结构。

In this study, two different origami pattern tubes are introduced. Unlike existing traditional thin-walled structures, there are some folds around origami tubes＇ wall. Firstly, this paper introduce the structure of two origami tubes. Next the finite element model of origami tubes are established and validated by experiments. Then, a parameter study on origami tubes indicates that b（the length of two adjacent vertexes）, l（the width of two adjacent vertexes） and t（wall thickness） have significant influence on crashworthiness. Finally, the multiobjective optimization is carried out to obtain an optimized structural configuration for maximizing SEA and minimizing IPF. By adopting RBF surrogate model and NSGAII,the Pareto optimal solutions are derived. The results show that origami tubes have superior crashworthiness and can be potential energy absorbers.